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6 Topic 3

Topic 3 Solids, Liquids, and Gases

TermDefinition
solid has a definite shape and a definite volume because particles are packed very closely together; can be hard and brittle or flexible, smooth and heavy or sharp and light
liquid has a definite volume but no shape of its own because particles are always in contact with each other but can move more than a solid
gas has no definite shape or volume because particles do not remain in contact with one another and move to fill all available space
thermal energy the total kinetic and potential energy of all particles in an object or substance; increase by adding heat
temperature a measure of the average kinetic energy of the particles in an object or substance; measured in degrees Celsius or degrees Fahrenheit
melting point the temperature at which a substance changes from a solid to a liquid; the same as the freezing point
freezing point the temperature at which a substance changes from a liquid to a solid
boiling point the temperature at which a substance changes from a liquid to a gas
evaporation vaporization that takes place only on the surface of a liquid
condensation the change in state from a gas to a liquid
pressure the force of pushing on a surface divided by the area of that surface; measured in units of pascals (Pa) or kilopascals (kPal)
phase change physical change in which a substance changes from one phase/state to another
volume the amount of space that matter takes up
mass the amount of matter in a given space
Created by: muellershauna
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